Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e17b7ab70671a0b…

MALICIOUS

PDF

97.7 KB Created: 2021-09-15 21:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d013b66bfa5d61c0215f14f80c222ea6 SHA-1: a64819a4f5d632bd9f4c270b1a8fb9d484f81039 SHA-256: 5e17b7ab70671a0b4ba005185ae624ea56720162f06e4ea7eb5a86fb87121d5b
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs, many of which are unknown or lead to other PDF files, suggesting a lure to download further content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass security scanning. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://caogenzhiben.com/filespath/files/20210911094415.pdf In PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/52643165093.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/64638855449.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/molowugu.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/zidog.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/wosid.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/97608613083.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/54529031985.pdfIn PDF document text
    • https://regenerateacademy.com/file/33190079462.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/sobijavameguredonokuzegi.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/nexukunatuxevajogaxo.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/46665244283.pdfIn PDF document text
    • http://citty.org/images/uploads/file/67832600334.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/2250755270.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210909181220.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/dikekoxizene.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/rasumebafuretewevabusaki.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/wirepijabijoguwopuf.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/wagigeligenefowuzesuvowa.pdfIn PDF document text
    • https://fptica.ru/images/file/wifanoxeneto.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/13193467434.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/zijefibenejebejizum.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1613d882fe8149---27203863810.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/xolulire.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/vulenipusuvijo.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/73160126073.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=aplicativo+bloquear+tela+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11310 20972 bytes
SHA-256: adb16d096dc922ded9d950cd5b6baa47bf0ae0a7f14bd06fca72811f1da19796
font_01_sfnt_off00014805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14805 10772 bytes
SHA-256: 864953a08bc01d7a625c8349366f32a0ac0b6d67806dd405b123a352bb5154e0
font_02_sfnt_off0001608e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1608E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1